Restaurant margins are thin by design. A well-run full-service restaurant might earn 3% to 6% net profit. Fast casual does a bit better at 6% to 9%. If your margins fall below those benchmarks or keep trending down, the problem usually lives in one of a few places.

Food costs are the first place to look. Your theoretical food cost is what you should be spending based on recipes and menu prices. Your actual food cost is what you’re really spending. The gap between them represents waste, theft, over-portioning, or spoilage. Most restaurants don’t calculate theoretical food cost, so they have no idea how big the gap actually is.

Track your cost of goods sold weekly, not monthly. Monthly is too slow. By the time you notice food cost jumped from 31% to 36%, you’ve already lost a month of margin. Weekly tracking lets you spot problems while you can still fix them.

Labor is usually the second-largest expense after food. In most restaurants it runs 25% to 35% of revenue. The question isn’t just total labor cost but labor productivity. Are you over-staffed during slow periods? Is overtime eating into margins because scheduling is reactive instead of planned?

Compare your labor percentage by shift and by day. Lunch might be running efficiently at 22% while dinner runs 38% because you’re scheduling based on habit rather than actual covers. A good restaurant bookkeeping setup tracks labor against revenue so you can see these patterns.

Menu pricing matters more than most owners realize. When ingredient costs rise, many restaurants are slow to raise prices. That 50-cent increase in chicken costs might seem small, but across 200 plates a week it adds up fast. Review your menu pricing against current costs quarterly at minimum.

The underlying problem in most thin-margin restaurants isn’t any single issue. It’s poor visibility. Without accurate books and timely reports, you’re making decisions based on gut feel instead of data. You think you know your food cost percentage but you haven’t actually calculated it in months. You think labor is fine but you’re not tracking it against revenue by day.

Good bookkeeping gives you the numbers to diagnose problems. Better tracking systems give you those numbers fast enough to act on them. Scottsdale bookkeeping services that understand restaurant operations can set up reporting that shows you where margin is leaking before it’s too late to fix.